Improvement in cut-off-valve gear for steam-engines



UNITED STATES PATENT OEEICE.

JOSEPH E. HAMILTON, OE PITTsBUEG, PENNSYLVANIA.

Specification formingpart of Letters Patent No. 39,22@ dated July 14, 1663.

To all whom t may conce-rn Be it known that I, JOSEPH F. HAMILTON, of Pittsburg, in the county ot' Allegheny and State of Pennsylvania, have invented a new The nature of my invention consists in op y eriting the valves of steam-.engines by means of the device hereinafter described, said device being so arranged and operated thatit will cause the valve or valves to cut oft' or admit steam to the cylinder in proportion to the power required of the engine.

'lo enable others skilled in the art to make and use my invention, I will proceed to de scribeV its construction and operation.

In the accompanying drawings, Figure lis a side view of the apparatus for operating the valves. Fi g. 2represents the arm used l'or regulating the liftofthe valve. Fig. 3 representsa ,jointed arm, which may be used for regulating the lit't ofthe valve. Fig. 4 is a sectional view of the lifters and ioclrshat't.

ln the accompanying drawings, o represents the hase'otthe frame c. Inside of the traine c is placed a frame, m, which is turnished with guides or slides u and a stem, q, which passes through the top bar ot' frame c. To frame m is also attached the stein of valve b. (lepresentedin dotted lines.) On thetopot' the cross-bar offra me c are placed two columns, r, on the top of which is placed a cross piece, S, through which passes a rod, o, which is attached in any known way or manner to the governor ofthe engine. lo rod o are attached two arms, n, which pass through openings in the columns r, and are attached to two arms, j, whichare attached to the lugs t on frame c. Un the lower end of the arms j are wrists lr, which move in slot lofthe regulating-arms h, which pass through openings in frame o, which are indicated by the dotted lines marked o. The arms h also pass through openings made in the frame m and guides or slides-u.

represents the litters, which are attached to lugs 4 on the rock-shaft. e, which is furnished with a stop, y, against which rest the lower ends of the litters t'.

The dotted lines p represent the bearings of the rocleshaft e', the crank of which is represented by the red dottedl linesf.

It will he observed that the litters t' may be made stationary on the rock-shaft e, and the arms ijointed, as represented in Fig. 3 2th .1). i

g represents a spring used for the purpose of holding the liftersin their proper position. The litters are made flexible for the purpose ot"allowing them toyield to the arms h after having passed them in lifting the valve.

l, 2, and 3 rcpresentjoints.

I wish it to be clearly understood that I do not contine myself to any particular form or size of frames and other parts, provided the same end is accomplished.

lhe operation ot' my improvement is as follows: I attach the cam-rod ot' the engine to the crank fon the rock-shaft e, which willimpart an oscillating motion to the lfters fi, which come in contact with the regulatingarms h, and thereby lift the frame m, which will lift the .valve attached to it. The arms It are drawn out and forced in by the governor raising and lowering the rod 0. When the arms It are torced in to their full extent then the valve will he lifted to its full extent and the engine will be working full stroke. The steam is cnt ot't' in proportion to the distance that the arms h are drawn out by the Iaction of the governor.

It will he observed that by the use of this improvement I cut off or admit steam to the cylinder ot' the engine in proportion to the work that the engine is required to perform.

Having thus described thc nature, construction, and Operation ot' my improvement, what I claim as of my invention is- The arrangement of the regulating-arms h, litters i, spring g, frames m and c, arms or levers j and n, when used in connection with the governor and rock-shaft or eccentric of engines, the whole being arranged, constructed, and operatin g substantially as herein described, and for the purpose set forth.

JOSEPH F. HAMILTON. Witnesses:

J Aims J. JOHNSTON, ALEXANDER HAYs. 

